Cognomen 瑜贞 (瑜贞 
) , around the globe, is a very rare surname. The family name 瑜贞 is habitual in Eastern Asia, particularly China, where it is an extremely rare surname. More frequently, 瑜贞 is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| 瑜贞 | China |